# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)
# Part of the Fusion Plating product family.

from odoo import api, fields, models


class FpTank(models.Model):
    """A physical vessel that holds a bath.

    Tanks are long-lived assets. Baths come and go inside a tank. The
    separation lets a shop dump an exhausted bath without losing the
    tank's history, QR code, or equipment records.

    Each tank carries a unique QR code for operator scanning at the
    shop-floor station.
    """
    _name = 'fusion.plating.tank'
    _description = 'Fusion Plating — Tank'
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _order = 'facility_id, work_center_id, sequence, code'

    name = fields.Char(
        string='Tank',
        required=True,
        tracking=True,
    )
    code = fields.Char(
        string='Code',
        required=True,
        tracking=True,
        help='Short unique tank identifier (e.g. "T-01", "EN-A1").',
    )
    qr_code = fields.Char(
        string='QR Code',
        help='Scannable identifier. Defaults to code, can be set to a longer URI.',
    )
    sequence = fields.Integer(
        string='Sequence',
        default=10,
    )
    active = fields.Boolean(
        string='Active',
        default=True,
    )
    facility_id = fields.Many2one(
        'fusion.plating.facility',
        string='Facility',
        required=True,
        ondelete='restrict',
        tracking=True,
    )
    work_center_id = fields.Many2one(
        'fusion.plating.work.center',
        string='Work Center',
        domain="[('facility_id','=',facility_id)]",
        ondelete='restrict',
        tracking=True,
    )

    # ----- Physical properties --------------------------------------------
    volume = fields.Float(
        string='Volume',
        help='Working volume.',
    )
    volume_uom = fields.Selection(
        [
            ('l', 'Litres'),
            ('gal_us', 'US gallons'),
            ('gal_imp', 'Imperial gallons'),
            ('m3', 'Cubic metres'),
        ],
        string='Volume Unit',
        default='l',
    )
    material = fields.Selection(
        [
            ('polypro', 'Polypropylene'),
            ('pvc', 'PVC'),
            ('pvdf', 'PVDF'),
            ('ss', 'Stainless Steel'),
            ('lined_steel', 'Lined Steel'),
            ('glass', 'Glass'),
            ('other', 'Other'),
        ],
        string='Construction',
    )
    heating_type = fields.Selection(
        [
            ('none', 'None'),
            ('immersion', 'Immersion Heater'),
            ('steam_coil', 'Steam Coil'),
            ('jacket', 'Jacketed'),
            ('external', 'External Heat Exchanger'),
        ],
        string='Heating',
        default='none',
    )
    has_filtration = fields.Boolean(
        string='Has Filtration',
    )
    has_rectifier = fields.Boolean(
        string='Has Rectifier',
        help='Required for electrolytic processes (chrome, anodize, strike).',
    )

    # ----- State ----------------------------------------------------------
    state = fields.Selection(
        [
            ('empty', 'Empty'),
            ('filled', 'Filled'),
            ('in_use', 'In Use'),
            ('draining', 'Draining'),
            ('maintenance', 'Maintenance'),
            ('out_of_service', 'Out of Service'),
        ],
        string='Status',
        default='empty',
        tracking=True,
    )

    # ----- Relations ------------------------------------------------------
    bath_ids = fields.One2many(
        'fusion.plating.bath',
        'tank_id',
        string='Bath History',
    )
    current_bath_id = fields.Many2one(
        'fusion.plating.bath',
        string='Current Bath',
        compute='_compute_current_bath',
        store=True,
    )
    current_process_id = fields.Many2one(
        'fusion.plating.process.type',
        string='Current Process',
        related='current_bath_id.process_type_id',
        store=True,
    )
    bath_count = fields.Integer(
        compute='_compute_bath_count',
    )

    _sql_constraints = [
        (
            'fp_tank_code_facility_uniq',
            'unique(code, facility_id)',
            'Tank code must be unique within a facility.',
        ),
    ]

    @api.depends('bath_ids', 'bath_ids.state')
    def _compute_current_bath(self):
        for rec in self:
            active = rec.bath_ids.filtered(
                lambda b: b.state in ('operational', 'under_review')
            )
            rec.current_bath_id = active[:1].id if active else False

    def _compute_bath_count(self):
        for rec in self:
            rec.bath_count = len(rec.bath_ids)

    @api.model_create_multi
    def create(self, vals_list):
        for vals in vals_list:
            if not vals.get('qr_code') and vals.get('code'):
                vals['qr_code'] = f"FP-TANK:{vals['code']}"
        return super().create(vals_list)